Exploring metal-supported few-layer graphene for photocathode application through Cs/O activation process
Source abstract
Abstract
Exploring a photocathode with features of visible-light response, high quantum efficiency, long life-span, easy availability and low cost is the desire of electron source applications. Here, we report the photoemission behavior of nickel-supported few-layer graphene through Cs/O activation process. We observe that this Cs/O-activated graphene-based photocathode can possess a cut-off response wavelength of 750 nm, a quantum efficiency over 0.1% at 350 nm, and a 1/e operating lifetime of over 50 h under continuous mW-level laser irradiation at a pressure of 10-7 Pa. Importantly, the photoemission capability after degradation can be completely restored again to its original maximum through the additional Cs deposition process. Moreover, the changes in surface composition and work function characterized by in-situ photoelectron spectroscopy demonstrate the low work function and excellent stability. This metal-supported graphene material with low-work-function surface provides a route to obtain robust photocathode working from ultraviolet to visible waveband.
Source: openalex_inverted_index · Quality: baseline
Research context
OpenAlex topics: Photocathodes and Microchannel Plates · Graphene research and applications · Plasma Diagnostics and Applications
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (48)
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